Custom intercept flow based on attribute value

[Marco Naimoli]

Hello, I wrote a simple intercept flow and it works; now I'd like to 
apply this intercept

only if an attribute has a specific value; to do so I've added the 
following decision state:

     <decision-state id="MyCheck">
         <if 
test="opensamlProfileRequestContext.getSubcontext(T(net.shibboleth.idp.profile.context.RelyingPartyContext)).getSubcontext(T(net.shibboleth.idp.attribute.context.AttributeContext)).getUnfilteredIdPAttributes().get('myattribute').getValues().get(0).equals('N')"
             then="ActionTrue" else="ActionFalse" />
     </decision-state>

"myattribute" has two possible values, "S" or "N"; but the result of the 
decision-state is always "ActionFalse", even if

I set the attribute with the static value of 'N'

Logs says:

Executing [Transition at 4e74d03d on = *, to = ActionFalse]

Does anyone can help me to understand what's wrong with my test condition ?

Thank you

Marco